Hi malware fighters,
Mutex
MUTual EXclusion object. Mutex is a program object that allows multiple threads to share the same resource. Any thread that needs the resource must lock the mutex from other threads while it is using the resource. The mutex is unlocked when it is no longer needed or the thread is terminated. The difference between mutex and semaphore is that a mutex is owned by the thread which locked it (that is, only the process which locked the mutex can unlock it). Whereas a semaphore can be changed by another thread or process.
Other specific tools for finding malicious mutex instances can be found here
http://www.softpanorama.org/Unixification/windows_process_viewers.shtml
Get the mutex enumerator, http://evilcodecave.blogspot.com/2010/06/just-little-gui-based-mutex-enumerator.html?showComment=1275675978316#c7237159814414838937
pol